The problem is that the touchpad (cursor and clicking) doesn't work, it does nothing. The only way to fix it is to plug an external mouse, which isn't the optimal. I already checked the system preferences and the touchpad is enabled.

I used Ubuntu 13.04 before, and it worked. Then I installed Linux Mint and the touchpad stopped working, that's way I installed 13.10, but now it doesn't work here either.